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PH Buffer Powder for FA Tester Calibration Solution Mixture PH 4 6.86 by CyberTech. Calibration: — Immerse the tester up to the maximum immersion level in the PH 4 or 6.86 buffer solution. (Package Includes 4 pack of PH substance which makes 250 ml buffer solutions, PH 4 or PH 6.86). — Allow the reading to stablilize and using the small screwdriver adjust the calibration trimmer to reading 6.9 warning: — Keep away from Children. In case of skin contact, rinse with water. PH Buffer Powder for FA Tester Calibration Solution Mixture PH 4 6.86 by CyberTech